Stencil-printing machine.



No. 866,718. PATENTED SEPT. 24, 1907. A. B. DICK. STENCILPRINTING'MAGHINE.

APPLICATION FILED JAN. 5, 1904.

2 SHEETS-SHEET 1.

WITNESSES: I; 42215 'ATTORNEY No. 866,718. PATENTED SEPT. 24, 1907.

r A. B. DICK.

STENCIL PR INTING MACHINE. APPLICATION FILED JAN. 5. 1904.

2 SHEETS-SHEET 2.

inmss s; INVENTOR QM4 I M. BY

(4M6 ATTORNEY UNITED STATES ALBERT 'B. nroK, OF CHICAGO, ILLINOIS,Assreivos To A. B. DICK ooMPANYjoFoHIoAGo,

PATENT OFFICE.

ILLINOIS, A CORPORATION OF ILLINOIS.

STENCIL-PRINTING MACHINE.

Specification of Letters Patent.

Patented Sept.. 24', 1907.

Application filed January 5, 1904. Serial No. 187,833.

H drum suitably supported and provided with mech- 7 movement.

anism for imparting thereto a rotary or oscillating the necessarytension to cause said rods to' retain their place'in said notches orrecesses. Over said pad the stencil is placed, suitable means beingemployed for securing one or both of the ends thereofin position againstthe tendency, due to the rotation of the drum, j to displacement. As anexampleof such means, I refer to the use of'a bar extending between andconnecting the heads of-the drum and providedwithprojections over whichthe forward end of the stencil is placed.

The presentjinvention concerns particularlymeans for securing theforward end'ofthe stencil in place upon the drum. I have found thatsuchfo'rward end may be lfeld firmly in position against the strainabove referred to, by means of a device movably carried, preferably bythe drum heads, and capable of being readily thrown topperative positionto hold the stencil or to inoperative position to remove it. In thepresent emoodimentof the. invention, thisdevice isarranged to coact withthe pad-holding rods above referred to, and comprises a bailhaving endsturned at an angle to the body portion thereof, said ends being pivotedupon the inner surfaces of the drum heads. Said body portion liesparallel, and coacts, with the rodsby means whereof the pad is securedupon the stencil-carrying portion of the drum. Where the material ofsuch pad is wrapped around such drum, the fastening device here referredto is additionally advantageous, since the pressure upon the stencil isa yielding one, rather than a rigid onel l The invention is illustratedin the accompanying drawing, in which Figurel isa side elevation of aportion of a stencil- .printing machine with my invention appliedthereto,

and Fig. 2 is a top plan view thereof.

Referring to this drawing, in' which similar,letters idenotecorresponding parts, A, B desigmate the drum heads, here shown aspivotally mounted upon a frame, which not forming part of the presentinvention will not be described in detail. Extending between these headsis the stencil-carrier-G of foraminated material. If desired, theforward edge of said carrier may terminate in a bar extending betweenthe drum heads A, B, althoughthis is not essential, as will presently-beseen. Such a bar, D, is here shown, but reference thereto as a bar isnot to be construed as excluding the-use of the 7 forward edge of thecarrier itself for the same purpose.

- E-designates the inking pad. Preferably,'a1though not necessarily,this is formed of an endless band of felt, flannel or other textilematerial, and is provided dropped into its coacting notches'in'the drumheads A,

B, distant from those just referred to. This places said pad under thenecessary strain to maintain it in position.

G designates the stencil-clamping device, here shown as comprising themain or body portion 9 having angular rearwardly-turned ends 9 pivotedat g upon the inner surfaces of the drum heads A, B. Theforward edge ofsaid clamping device is provided with a downturned lip 9 which, when theclamp is in operative position to secure the forward edge of the stencilupon the, drum, coacts, in the present instance, with the forward rod F,whereby the'pad E is secured upon the stencil-carrier G.

In applying the stencil, the same is laid over the pad E, its forwardedge being down-turned over the forward rod F. The clamp G is thenpressed toward its operative position, in which the down-turned lip 9coacting with the forward pad-holding rod F, will firmly bind theforward edge of the stencil in position and hold the same against thetendency, due to the rotation of the drum, to loosen said stencil anddisplace'it.

I here observe that the clamping device above de scribed may, ifdesired, be used in connection with or -in addition tootherstencil-holding devices adapted, for instance, to coact withstencils of a certain sort only.

Thus, I have indicated on Fig. 1 of the drawing a bar extending betweenthe heads A, B of the drum, and provided upon its upper surface withstuds'or projections adapted to extend through perforations in theforthe drawing, so that a stencil may be secured in position regardlessof whether the same be specially adaptedfor coaction with the particularsecuring means or not. Thus, if the stencil be adapted for coaction withstuds upon a bar, as indicated in Fig. 1, the clamping device may beswung backwardly and inwardly toward the axis of the drum, the stencilplaced in position over the studs and the clamp swung to operativeposition when it will overlie and protect the advancing forward edge ofthe stencil which is commonly subjected to excessive wear. On the otherhand, if such stencil be unprovided with special means of attachment,as, for instance, the perforations designed to coact with studs orprojections upon a cross-bar, the forward edge of the same may, as aboveindicated, be turned inwardly over the forward pad-holding rod F orother suitable part of the drum, and the clamping device operated asabove described to sefire such forward edge in position.

Preferably, means will be employed for locking the clamp in operativeposition, in order to prevent detachment thereof fas, for instance, bythe jar of the machine. In the drawing, I have shown the main or body.portionof the clamp as provided with a spring having I downwardlyturned forward end, so arranged as to coact and ,this or these may coactwith pins or projections carried upon the inner snrfaceof the drum headsA, B.

Such a modification of the mechanism illd strated in the drawing isobvious and does not, therefore, require illustration.

While I prefer; upon practical considerations, to employ the clampingdevice in coaction with the forward pad-carrying rod asliereinabovedescribed, I do not Of course, if such aprodesire to be understood aslimiting the'invention there to. If such a rod be not employed, theclamp may coact with any other device holding the pad-in position, or ifthe pad do not extend over the end of thestencilcarrier (or such a baras may be employed-to boundthe edge of sdch stencil-carrier), then suchclamping device may coact with the end of said carrier or such a bar,the forward edge of-the stencil being turned over the same, in order topermit it to be clamped in position,-

as hereinabove described.

Having now described my invention, what I claim as new therein anddesire tosecure by Letters Patent is as follows 1. In a stencil-printingmachine, the combination with a. drum, of a part moving with said drumand aifording means for attachment'oi' the forward end of astencil-sheet,

a device adjacent to said'part, and mechanism in juxtaposition to saidpart and adapted to enact with said device to secure the end or thestencil-sheet in position on said dram, substantially as set forth.

2. In a stencil-printing machine, the combination with a drum, of a partmoving with said drum and having projections for coaction with theforward end of a'stencil-sheet, and a movable securing device adjacentto said part and moving with said drum, said device being adapted tosecure the forward end of a stencil-sheet in positionfaulr stantlally asset forth.

3. In a stencil-printing machine, the combination with a drum. of a partmoving with said drum and affording means for attachment of 'the forwardend 01 a stencil-sheet, a supporting member carried by said drumrearward of said part. and a movable securing device carried by the drumforward of said part and adapted to coact with said member to secure theforward end of the stencibsheet in position on the drum, substantiallyas set forth.

This specification signed and witnessed this -28 day of December 1903.

ALBERT B. DICK;

Witnesses:

M. H. BvnxAsr, R. R. Hmmnozros.

